I know nothing about Dart frogs, but googling "dart frog habitat" then looking at the images, sure gives a lot of ideas. I'd assume from them that dart frogs prefer mostly land area. I have a few fire belly toads. They like a viv that's slightly more water than land. This user just posted a setup that he did for fire belly toads (FBT's) and I really like the simplistic modern styling of it....... http://www.frogforum.net/showthread.php?t=34637